Due to a shortage of production taillamps, vehicles have been built with substitution lamp assemblies. The break- points for substitution lamps at the affected assembly plants are as follows:
Fairfax - started with VIN FX107787
Oshawa - started with VIN F9106048
Taillamp substitution should end approximately in December, 1984. The visual difference in taillamps is as shown below:
Service usage as follows:
Regular service part number 5931937-8 Substitution part number 5968305-6
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.